Power flushing, by hand, properly
Repairs and Servicing
Power flushing, by hand, properly
Cold radiator bottoms, sludgy water, kettling boilers. We hand-flush every radiator individually with a magnetic filter on the return, dose the system, and fit a Magna Clean as standard. From £450 fully fitted with a written before-and-after report.
When a power flush is the right call
If your radiators are cold at the bottom but warm at the top, if some rooms never quite get there even with the thermostat cranked up, or if the boiler is making a low kettling rumble, the system is almost certainly carrying sludge. Sludge is iron oxide that builds up in older central heating circuits, settles in radiator bottoms and pump impellers, and gradually chokes the flow. A power flush physically shifts it, inhibitor stops it coming back, and the Magna Clean we fit on the return catches whatever the system produces over the next few years.
What we actually do on the day
Two engineers, one full day for a normal three-bed home. We isolate the boiler from the circuit, connect a flush pump and a magnetic filter to the return, dose with the cleaning chemical, and then work radiator by radiator: each one isolated, opened up, flushed in both directions, and put back into the circuit. Nothing rushed. The water we extract goes through the magnetic filter so we can show you what we shifted. At the end we re-balance the radiators, dose the system inhibitor, fit the Magna Clean if not already there, and leave you a one-page written flow report.
Magna Clean filter, fitted as standard
The biggest reason a flush “doesn’t last” is that the system goes straight back to producing sludge. A magnetic filter on the return catches the iron oxide before it settles, and a quick clean of the filter at each annual service keeps the system clean indefinitely. Every power flush we do comes with a Magna Clean fitted to the return next to the boiler. We can also retrofit one as a standalone job for around £225 fully fitted, including an inhibitor top-up. Read more on our boiler servicing page for the annual checks that keep the filter doing its job.
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What our customers say.
I have used Basi for a number of years and this is the 3rd boiler they have fit for me. They are very easy to deal with, offer advice and a quick competitive quote. The jobs are planned in a timely manner and you don't have to wait long. The overall service of the office staff and fitters is friendly, professional and carried out to a high standard. The aftersales service is very good too. Would highly recommend.
New boiler fitted today! Perfect job from setting up the job, price of quote and workmanship. All very professional, friendly, super efficient and experienced. Choice of boiler was a good brand, Valliant sustan 28..really quiet whilst on and fits perfectly in my boxed unit. Good communication prior to day of fitting, fitter arrived on time, punctual and really confident in his work and know how. Reliable, friendly and really good quality workmanship. Happily completed an extra radiator job for me besides the boiler. Would recommend to future customers wanting to replace a boiler
I wanted to leave a massive thank you to Jaspal and Kultar for their incredible help recently. One of our tenant's properties had a boiler breakdown, and since it was 13 years old, it just wasn't worth repairing. I called Basi Heating, and Kultar managed to get out to the property that very same morning. It was a freezing day, and the situation was urgent because the tenants were struggling without heat or hot water—made even more critical as their grandfather lives with them. Despite being busy, Kultar managed to squeeze us in to ensure they weren't left in the cold. He handled the survey efficiently and clearly explained the situation. We received solid, honest advice along with a very competitive price. To top it off, the delivery and installation were completed within 48 hours. The experience and knowledge here speak volumes. I can't recommend them enough—keep up the fantastic work! Highly recommended. Kind Regards Roop
Got in contact with basi heating. As my old boiler wasn't safe to use. Within 5 working days they booked me in for a new boiler to be installed. The engineers arrived within the time frame given. Very professional and the installation of the new boiler is excellent. Fantastic customer service all round. Highly recommend. And will be using basi heating for the servicing of the boiler. When required.
I had Basi to install my boiler over 30 years ago, it was on its last leggs, had lots quotes and people saying it was a big job! Called Basi, came out same day, affordable price, following week it was in, great staff, explained everything, very clean, neat, quick service, highly recommended 👍
Rated 5★ from 424 reviews on Trustpilot and 4.7★ from 210 on Google. Read more customer reviews from across Yorkshire.
Questions
The questions we get asked most.
How do I know if I need a power flush?
Tell-tale signs are radiators that are cold at the bottom but hot at the top, radiators that take a long time to warm up, brown sludgy water when you bleed a rad, the boiler making a kettling noise, or your system needing repressurising often. We'll confirm with a flow check before we quote.
How long does a power flush take?
A standard 8-10 radiator system takes one full day with two engineers. Larger or older systems can run into a second day. We work radiator by radiator with a magnetic filter on the return so we capture everything we shift.
What does the price include?
Chemical pre-treatment, the full hand-flush of every radiator and the boiler heat exchanger, a system inhibitor dosed before we leave, a Magna Clean filter fitted on the return as standard, and a written before/after flow report. No upsell on the day.
Is a power flush worth it on an old system?
Not always. If the boiler is 12+ years old and the radiators are mostly cold-spotted, a flush can buy you a few more winters, but a new high-efficiency boiler with a system clean often makes more financial sense over five years. We'll show you both numbers and let you choose.
Do you fit a filter as part of the job?
Yes. A Magna Clean is included in the standard power-flush price, fitted on the return next to the boiler. It catches the magnetic sludge your system will produce over the next few years, so the flush lasts much longer.
Boiler down right now?
No heat or hot water? Call us, we will pick up.
Need a repair today? Call the office, not a booking form, and we can often get you a same-day appointment across BD, LS, WF, HD, HX and HG. Gas Safe engineers, parts on the van for the common faults, no separate call-out fee.